Role-played “gunmen” shoot a security guard, as a simulation in a planned counter-terrorism exercise code-named “Bright Dog”.

Role-played “gunmen” take "concertgoers" hostage in a confrontation with the police. It is a simulation of a planned counter-terrorism exercise code-named “Bright Dog”.

Police officers guide "concertgoers" to safety, as a simulation in a planned counter-terrorism exercise code-named “Bright Dog”.

Armed police officers cordon the concert hall, as a simulation in a planned counter-terrorism exercise code-named “Bright Dog”.

Police negotiating with role-played “gunmen”, as a simulation in a planned counter-terrorism exercise code-named “Bright Dog”.